computer organisation and organisation
Question 1

a) Determine the value of base x if (211)x = (6A)16 [5 marks]

b) Convert the followings: [3+3=6 marks]

i) 0xBAD into a decimal number

ii) 58810 into a 3-base number

c) Given a (very) tiny computer that has a word size of 6 bits, what are the smallest negative numbers and the largest positive numbers that this computer can represent in each of the following representations? [3 +3 = 6 marks]
i) One’s complement

ii) Two’s complement

Question 2.

a) Consider the following logic diagram of a combinational circuit where A, B, and C are inputs and Q is the output. Three 2-input AND gates and two 2-input OR gates are used in the circuit. It is possible to reduce some of the logic gates without changing the functionality of the circuit. Such component reduction results in higher operating speed (less delay time from input signal transition to output signal transition), less power consumption, less cost, and greater reliability. Construct a logic diagram of a circuit which does have the same function output with only two logic gates (instead of five). Please show the steps. [8 marks]

b) Using basic Boolean algebra identities for Boolean variables A, B and C, prove that ABC+ ABC’ + AB’C + A’BC = AB + AC + BC. Please show all steps and mention the identities used. [5 marks]

computer organisation and organisation
Question 1

a) Determine the value of base x if (211)x = (6A)16 [5 marks]

b) Convert the followings: [3+3=6 marks]

i) 0xBAD into a decimal number

ii) 58810 into a 3-base number

c) Given a (very) tiny computer that has a word size of 6 bits, what are the smallest negative numbers and the largest positive numbers that this computer can represent in each of the following representations? [3 +3 = 6 marks]
i) One’s complement

ii) Two’s complement

Question 2.

a) Consider the following logic diagram of a combinational circuit where A, B, and C are inputs and Q is the output. Three 2-input AND gates and two 2-input OR gates are used in the circuit. It is possible to reduce some of the logic gates without changing the functionality of the circuit. Such component reduction results in higher operating speed (less delay time from input signal transition to output signal transition), less power consumption, less cost, and greater reliability. Construct a logic diagram of a circuit which does have the same function output with only two logic gates (instead of five). Please show the steps. [8 marks]

b) Using basic Boolean algebra identities for Boolean variables A, B and C, prove that ABC+ ABC’ + AB’C + A’BC = AB + AC + BC. Please show all steps and mention the identities used. [5 marks]